One restless night, Franca has a vivid and startling dream about a marvelous queen who lives deeply hidden inside a dark forest cave. Unable to sit still until she uncovers the truth, Franca decides she must investigate. Along with her two younger sisters, Carmela and Tomasina, she bravely ventures into the wild woods at the very edge of their garden. As the three sisters travel deeper through tangled nettles and thickets, the world around them begins to shift in impossible ways. They encounter bizarre beasts and magical creatures that both shock and delight them, narrowly escaping terrible dangers along the way. Together, they must learn to be bold and face their deepest fears. What they finally discover waiting inside the cave is the most thrilling and unexpected magic of all.